 | | | 32 versus 64-bit | 32 versus 64-bit 2005-08-25 - By Arjan van de Ven
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On Thu, 2005-08-25 at 16:02 +0300, Jussi Silvennoinen wrote:
>
> AFAIK 64-bit stuff runs slightly slower in general than 32-bit.
> Biggest
> advantage is larger memory addressing capability.
that's true for 64 bit in general, but not for x86-64.
x86-64 is slower for some bits, but it has another big thing that
improves speed: x86 only has 5 general purpose cpu registers, x86-64 has
13. This gives the compiler a LOT more freedom to optimize and keep
precalculated things around, and helps both code size and speed quite a
bit.
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